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 Field Name  Data Description
Test Name  Urea Nitrogen, 24 Hour Urine
Code  Urea Nitrogen 24 Hour Urine., U Nitrogen Total 24H., U BUN 24
CPT Code  84540
Last Modified  5/15/2018 2:22:00 PM
Test Name  U24 Urea Nitrgn.
Synonyms  Urea U, lithol, BUN, Nitrogen Balance Study,
Patient Preparation  
Spec. Requirements  Urine
Tube  Plastic 24 hour urine container, no preservative
Collection Volume  10 mL aliquot of entire collection
Storage  Refrigerate, Ambient or Freeze 14 days
Routine TAT  
Days Test Performed  
Performed by BHS  None
See Availability  
Reference Lab  LabCorp of America
Reference Lab Code  003541 Urea Nitrogen, 24-Hour Urine
Clinical Use  Renal function test; coarse nitrogen-wasting test on patients on hyperalimentation; indicate nitrogen balance in hyperalimentation; rule out tap of urinary bladder in amniocentesis, paracentesis
Reference Range  
Critical Value  
Testing Sample Type  Urine (24 Hour)
Min Lab Testing Volume   1 mL aliquot
Special Handling  Record total 24-hour urine volume on the request form. Collection:Refrigerate the specimen as it is collected. Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning). Screw the lid on securely. Container MUST be labeled with patient's full name, date and time collection started, and date and time collection finished.
Lab Notes  
Methodology  Urease
Limitations  Causes for Rejection: Improper labeling

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